On a rainy night in Paris, doctor Yann Voline hits a young and naked woman with his car. This accident will turn his life upside down.

The young woman has no memories but she knows everything about Yann. She absorbed the doctor's memories as if they were her own. She can also read the minds of others.

An unknown bacteria is found in the young woman's blood. Martin, the laboratory technician, is infected and runs away. A strange man shows up at the hospital. He claims to be the woman's father.

The alleged father carries the toxic mold of a plant that has disappeared for 4,000 years. He ransacks the laboratory before being neutralized. WHO experts take over the hospital and their discoveries are far beyond scientific knowledge.

Yann and the young woman set off in search of a high school student who has been missing for six years. They find her in a critical condition and can only be saved by the mysterious woman.

The young woman disappears. Yann desperately looks for her while the high school student is rushed to hospital in a deep coma. Blood tests show that she was contaminated with the mysterious bacteria.